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Old system, need to upgrade

I've got a very old 12 station Richdel controller for my sprinkler system that I need to upgrade. Really, I need to upgrade a lot more than just the controller. The system works as is, although I need to replace some very leaky sprinkler heads, which I've been working on over the years when one gets bad.

Is there a sprinkler system 101 source where I can learn how this old system compares to the new systems? Searching the forum is a good tool, but I need some overall basic knowledge before much of what I'm reading here makes sense.

I notice that there is wiring that comes with the new systems, which my unit does not use. It seems everything about mine is water driven with no power hookups other than the main box. I'm wondering if I should just continue to use mine, or start switching out valves and the control box. As you can tell, I know very little about these systems, but I am handy enough to switch components out myself.

Actually, I just didn't know what I was talking about. Once I cracked open the case, I discovered it is electrical just like the newer ones. I am in process of uncovering all of the valves. The valve boxes have covered over with dirt over the years. Once I clean out the boxes, I'll know more if I need to bother with replacing or not. I'm beginning to agree that I may not have to bother. Just repair the sprinkler heads as needed.

Is there a generic diagram of sprinkler systems with all the different components?